Reverend Jackson is in the UK on a three-day visit hosted by Operation Black Vote to celebrate the 50th anniversary of Dr King's 'I have a dream' speech.

Rev Jackson who was a friend and colleague of the assassinated Dr Martin Luther King will speak about the legacy of that speech and what it means for today's generation to an assembly of around 200 students aged 10-15.

A ceremony will take place in Trafalgar Square later today to mark 50 years since Martin Luther King Junior delivered his I Have A Dream speech.

50 to 70 young people will ring bells at 3pm to mark the moment the civil rights leader concluded his historic address in Washington in 1963.

The Let Freedom Ring event will be broadcast live from the YouTube studios in London via a Google+ Hangout On Air, following a panel discussion exploring the historical significance of the speech's message to young British people in the 21st century.